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Note 6 - Capital Stock, Stock Plans, Warrants, and Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Stock Options Roll Forward [Table Text Block] |
|  | Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value (2) |
Options outstanding January 1, 2016 |  |  | 218,200 |  |  | $ | 7.65 |  |  |  |  |  |  |  |  |
Granted |  |  | 62,000 |  |  |  | 4.09 |  |  |  |  |  |  |  |  |
Exercised |  | ─ |  |  | ─ |  |  |  |  |  |  |  |  |
Forfeited/expired |  |  | (33,000 | ) |  |  | 8.14 |  |  |  |  |  |  |  |  |
Options outstanding end of period (1) |  |  | 247,200 |  |  | $ | 6.69 |  |  |  | 4.3 |  |  | $ | 20,940 |
Options exercisable at December 31, 2016 (1) |  |  | 181,867 |  |  | $ | 7.61 |  |  |  | 3.7 |  |  | $ | 20,940 |
Options vested and expected to be vested at December 31, 2016 |  |  | 239,750 |  |  | $ | 6.78 |  |  |  | 4.3 |  |  | $ | 20,940 |
|  | Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value (2) |
Options outstanding January 1, 2015 |  |  | 239,023 |  |  | $ | 7.81 |  |  |  |  |  |  |  |  |
Granted |  |  | 12,000 |  |  |  | 4.19 |  |  |  |  |  |  |  |  |
Exercised |  |  | (3,423 | ) |  |  | 2.79 |  |  |  |  |  |  | $ | 4,298 |
Forfeited/expired |  |  | (29,400 | ) |  |  | 8.13 |  |  |  |  |  |  |  |  |
Options outstanding end of period (1) |  |  | 218,200 |  |  | $ | 7.65 |  |  |  | 4.8 |  |  | $ | 14,676 |
Options exercisable at December 31, 2015 (1) |  |  | 169,533 |  |  | $ | 8.47 |  |  |  | 4.5 |  |  | $ | 14,676 |
Options vested and expected to be vested at December 31, 2015 |  |  | 212,333 |  |  | $ | 7.72 |  |  |  | 4.8 |  |  | $ | 14,676 |
Schedule of Nonvested Share Activity [Table Text Block] |
|  | Shares |  |  | Weighted Average Grant-Date Fair Value |
Non-vested options January 1, 2016 |  |  | 48,667 |  |  | $ | 2.87 |
Granted |  |  | 62,000 |  |  |  | 2.19 |
Vested |  |  | (30,334 | ) |  |  | 2.87 |
Forfeited |  |  | (15,000 | ) |  |  | 2.88 |
Non-vested options at December 31, 2016 |  |  | 65,333 |  |  | $ | 2.23 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Employee Stock Option Granted May 15, 2016 |
Weighted-average fair value per share |  | $ | 2.00 |
Risk -free interest rate (1) |  |  | 1.27% |
Expected volatility of stock (2) |  |  | 53.12% |
Dividend yield |  |  | None |
Expected option life (3) (in years) |  |  | 6.0 |
|  | Outside Director Stock Options Granted |
|  | July 28, 2016 |  |  | September 17, 2015 |
Weighted-average fair value per share |  | $ | 3.0 |  |  | $ | 2.84 |
Risk -free interest rate (1) |  |  | 1.52% |  |  |  | 2.21% |
Expected volatility of stock (2) |  |  | 55.99% |  |  |  | 57.98% |
Dividend yield |  |  | None |  |  |  | None |
Expected option life (3) (in years) |  |  | 10.0 |  |  |  | 10.0 |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Year Ended |
|  | 2016 |  |  | 2015 |
Employee Stock Options |  | $ | 53,000 |  |  | $ | 53,000 |
Director Stock Options |  |  | 45,000 |  |  |  | 39,000 |
Total |  | $ | 98,000 |  |  | $ | 92,000 |

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